The the buttons in the "Focus on performance" are JS, replacing the local address, this is incompatible with multi-tabbed browsing and, I think, are also bad for accessibility.
The changes needed are similar to this:
- <button onclick="location.href='https://github.com/AdnanHodzic/auto-cpufreq'">Know More</button>
+ <a href="https://github.com/AdnanHodzic/auto-cpufreq">
+ <button>Know More</button>
+ </a>